Do they like being in college? If so, they probably should stay. At this point, a degree is looking like something that will be useful for both of them.
If they really don't want to be in college - then I'd say they should probably go. I'm not sure how much higher their ceiling is at this point and they're probably sick of all the scrutiny they get from the fans. I know I would be.
One scenario would be for one or both of them to play like All-Americans over the next 9 games and improve their stock tremendously. I wouldn't rule that out and, if so, they probably should go.